How do I get my flange to resolve?

tim_ashby

I'd like this flange on both sides of the model. Model file in question is Inserter.



Below are a few attempts at getting this to work - the problem seems to occur when the first flange is created on the other side.

https://cad.onshape.com/documents/894047f178a69979e5d421a2/v/f4d1c2d1fa6b612ca9d63dc5/e/67892f6a35401b87f1a308ab

Here, I had both initial flanges created in the same feature, which seemed to be a problem, but separating these out allowed some progression.

https://cad.onshape.com/documents/894047f178a69979e5d421a2/v/b7ad28d36e285b076ecf3897/e/67892f6a35401b87f1a308ab
https://cad.onshape.com/documents/894047f178a69979e5d421a2/v/1f5dfaf437e7ff45a3b9afab/e/67892f6a35401b87f1a308ab

These two files display basically the same problem - if the first flange on the other (left hand) side is below 20mm or so in length, Flange 16 just doesn't work.

https://cad.onshape.com/documents/894047f178a69979e5d421a2/w/bea36926bc95c216d9bf6d73/e/67892f6a35401b87f1a308ab

I had hopes of working around the problem, but it seems that if there is a flange on the left with a similar depth to the flange on the right, Flange 16 (in red) starts complaining about boolean failures.

Any suggestions as to why, please?

lana

@tim_ashby,
I've got this flange to work here   By moving both Flange 13 and Flange 16 earlier in the history and using move face instead of cut. Please see if this solution works for you.

john_mcclary

Your flanges are way too small. It would take a press break with near infinite tonnage to make that small of a bend. So Onshape is smart enough to point that out and not allow you to make such small flanges.

you will need to make them larger, then trim them back.
You will still get errors because Onshape is attempting to solve a flat pattern. So before that you will need to Finish the sheet-metal part.
This will be the manufacturing equivalent of bending a larger tab. then putting in on a band saw and trimming it to final size.

If you really want a flat pattern, then you can use https://cad.onshape.com/documents/d075777b23239493791a6871/v/3a17d545652276fcd92ed873/e/dba9566c2dda32a29752e76b?jumpToIndex=181
to get the flat pattern into the 3D drawing area, then make the trim on both the flat pattern flange and your part flange at the same time, making them parametric. 

But after a SM part has been marked "finished" you cannot add any more bends. so this will be the last operation on your tree.

lana

@tim_ashby,
I've got this flange to work here   By moving both Flange 13 and Flange 16 earlier in the history and using move face instead of cut. Please see if this solution works for you.

tim_ashby

Thanks for the fix, Lana. I've not used Move Face before, so it's been useful to see it in action.

Thanks John - I'd be interested to know how you got that screenshot! The reason for the small flanges is its part of a workaround for a hem, and if I'm understanding correctly, your solution wouldn't allow me to add further flanges to those little ones.

john_mcclary

If you want a hem, try @MBartlett21's hem feature
https://cad.onshape.com/documents/9190d114354a31d33ed2eb4f/w/e7f6e0681f2e4c2a355010d4/e/463e51e962c09affdef6c2df

He has tons of sheet-metal features you may like

emagdalenaC2i

@john_mcclary Actually Onshape has its own Hem sheet metal feature 
https://cad.onshape.com/documents/12312312345abcabcabcdeff/w/a855e4161c814f2e9ab3698a/e/1be7b53034b866b20141a528

I do not know why they have not announced it yet, they are possibly doing tests

ilya_baran

It's not announced because it is still under development and not yet ready for any use.

MBartlett21

john_mcclary said:

He has tons of sheet-metal features you may like

@tim_ashby
Please see https://forum.onshape.com/discussion/comment/48876/#Comment_48876 for an almost full list